/*
 * nheko Copyright (C) 2017  Konstantinos Sideris <siderisk@auth.gr>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <random>

#include <QApplication>
#include <QFileInfo>
#include <QSettings>

#include "Cache.h"
#include "Logging.h"
#include "timeline/TimelineView.h"
#include "timeline/TimelineViewManager.h"
#include "timeline/widgets/AudioItem.h"
#include "timeline/widgets/FileItem.h"
#include "timeline/widgets/ImageItem.h"
#include "timeline/widgets/VideoItem.h"

TimelineViewManager::TimelineViewManager(QWidget *parent)
  : QStackedWidget(parent)
{}

void
TimelineViewManager::updateReadReceipts(const QString &room_id,
                                        const std::vector<QString> &event_ids)
{
        if (timelineViewExists(room_id)) {
                auto view = views_[room_id];
                if (view)
                        emit view->markReadEvents(event_ids);
        }
}

void
TimelineViewManager::removeTimelineEvent(const QString &room_id, const QString &event_id)
{
        auto view = views_[room_id];

        if (view)
                view->removeEvent(event_id);
}

void
TimelineViewManager::queueTextMessage(const QString &msg)
{
        if (active_room_.isEmpty())
                return;

        auto room_id = active_room_;
        auto view    = views_[room_id];

        view->addUserMessage(mtx::events::MessageType::Text, msg);
}

void
TimelineViewManager::queueEmoteMessage(const QString &msg)
{
        if (active_room_.isEmpty())
                return;

        auto room_id = active_room_;
        auto view    = views_[room_id];

        view->addUserMessage(mtx::events::MessageType::Emote, msg);
}

void
TimelineViewManager::queueReplyMessage(const QString &reply,
                                       const QString &related_event)
{
        if (active_room_.isEmpty())
                return;

        auto room_id = active_room_;
        auto view    = views_[room_id];

        view->addUserMessage(mtx::events::MessageType::Text, reply, related_event);
}

void
TimelineViewManager::queueImageMessage(const QString &roomid,
                                       const QString &filename,
                                       const QString &url,
                                       const QString &mime,
                                       uint64_t size,
                                       const QSize &dimensions)
{
        if (!timelineViewExists(roomid)) {
                nhlog::ui()->warn("Cannot send m.image message to a non-managed view");
                return;
        }

        auto view = views_[roomid];

        view->addUserMessage<ImageItem, mtx::events::MessageType::Image>(
          url, filename, mime, size, dimensions);
}

void
TimelineViewManager::queueFileMessage(const QString &roomid,
                                      const QString &filename,
                                      const QString &url,
                                      const QString &mime,
                                      uint64_t size)
{
        if (!timelineViewExists(roomid)) {
                nhlog::ui()->warn("cannot send m.file message to a non-managed view");
                return;
        }

        auto view = views_[roomid];

        view->addUserMessage<FileItem, mtx::events::MessageType::File>(url, filename, mime, size);
}

void
TimelineViewManager::queueAudioMessage(const QString &roomid,
                                       const QString &filename,
                                       const QString &url,
                                       const QString &mime,
                                       uint64_t size)
{
        if (!timelineViewExists(roomid)) {
                nhlog::ui()->warn("cannot send m.audio message to a non-managed view");
                return;
        }

        auto view = views_[roomid];

        view->addUserMessage<AudioItem, mtx::events::MessageType::Audio>(url, filename, mime, size);
}

void
TimelineViewManager::queueVideoMessage(const QString &roomid,
                                       const QString &filename,
                                       const QString &url,
                                       const QString &mime,
                                       uint64_t size)
{
        if (!timelineViewExists(roomid)) {
                nhlog::ui()->warn("cannot send m.video message to a non-managed view");
                return;
        }

        auto view = views_[roomid];

        view->addUserMessage<VideoItem, mtx::events::MessageType::Video>(url, filename, mime, size);
}

void
TimelineViewManager::initialize(const mtx::responses::Rooms &rooms)
{
        for (auto it = rooms.join.cbegin(); it != rooms.join.cend(); ++it) {
                addRoom(it->second, QString::fromStdString(it->first));
        }

        sync(rooms);
}

void
TimelineViewManager::initWithMessages(const std::map<QString, mtx::responses::Timeline> &msgs)
{
        for (auto it = msgs.cbegin(); it != msgs.cend(); ++it) {
                if (timelineViewExists(it->first))
                        return;

                // Create a history view with the room events.
                TimelineView *view = new TimelineView(it->second, it->first);
                views_.emplace(it->first, QSharedPointer<TimelineView>(view));

                connect(view,
                        &TimelineView::updateLastTimelineMessage,
                        this,
                        &TimelineViewManager::updateRoomsLastMessage);

                // Add the view in the widget stack.
                addWidget(view);
        }
}

void
TimelineViewManager::initialize(const std::vector<std::string> &rooms)
{
        for (const auto &roomid : rooms)
                addRoom(QString::fromStdString(roomid));
}

void
TimelineViewManager::addRoom(const mtx::responses::JoinedRoom &room, const QString &room_id)
{
        if (timelineViewExists(room_id))
                return;

        // Create a history view with the room events.
        TimelineView *view = new TimelineView(room.timeline, room_id);
        views_.emplace(room_id, QSharedPointer<TimelineView>(view));

        connect(view,
                &TimelineView::updateLastTimelineMessage,
                this,
                &TimelineViewManager::updateRoomsLastMessage);

        // Add the view in the widget stack.
        addWidget(view);
}

void
TimelineViewManager::addRoom(const QString &room_id)
{
        if (timelineViewExists(room_id))
                return;

        // Create a history view without any events.
        TimelineView *view = new TimelineView(room_id);
        views_.emplace(room_id, QSharedPointer<TimelineView>(view));

        connect(view,
                &TimelineView::updateLastTimelineMessage,
                this,
                &TimelineViewManager::updateRoomsLastMessage);

        // Add the view in the widget stack.
        addWidget(view);
}

void
TimelineViewManager::sync(const mtx::responses::Rooms &rooms)
{
        for (const auto &room : rooms.join) {
                auto roomid = QString::fromStdString(room.first);

                if (!timelineViewExists(roomid)) {
                        nhlog::ui()->warn("ignoring event from unknown room: {}",
                                          roomid.toStdString());
                        continue;
                }

                auto view = views_.at(roomid);

                view->addEvents(room.second.timeline);
        }
}

void
TimelineViewManager::setHistoryView(const QString &room_id)
{
        if (!timelineViewExists(room_id)) {
                nhlog::ui()->warn("room from RoomList is not present in ViewManager: {}",
                                  room_id.toStdString());
                return;
        }

        active_room_ = room_id;
        auto view    = views_.at(room_id);

        setCurrentWidget(view.data());

        view->fetchHistory();
        view->scrollDown();
}

QString
TimelineViewManager::chooseRandomColor()
{
        std::random_device random_device;
        std::mt19937 engine{random_device()};
        std::uniform_real_distribution<float> dist(0, 1);

        float hue        = dist(engine);
        float saturation = 0.9;
        float value      = 0.7;

        int hue_i = hue * 6;

        float f = hue * 6 - hue_i;

        float p = value * (1 - saturation);
        float q = value * (1 - f * saturation);
        float t = value * (1 - (1 - f) * saturation);

        float r = 0;
        float g = 0;
        float b = 0;

        if (hue_i == 0) {
                r = value;
                g = t;
                b = p;
        } else if (hue_i == 1) {
                r = q;
                g = value;
                b = p;
        } else if (hue_i == 2) {
                r = p;
                g = value;
                b = t;
        } else if (hue_i == 3) {
                r = p;
                g = q;
                b = value;
        } else if (hue_i == 4) {
                r = t;
                g = p;
                b = value;
        } else if (hue_i == 5) {
                r = value;
                g = p;
                b = q;
        }

        int ri = r * 256;
        int gi = g * 256;
        int bi = b * 256;

        QColor color(ri, gi, bi);

        return color.name();
}

bool
TimelineViewManager::hasLoaded() const
{
        return std::all_of(views_.cbegin(), views_.cend(), [](const auto &view) {
                return view.second->hasLoaded();
        });
}